Title (fr)

Publication

Application

Priority

EP 98810914 A 19980914

Abstract (en)

The apparatus to detect and separate foreign matter (F) from material (M) carried in an air stream, and especially cotton fibers, has a detector and at least one ejection opening in the carrier channel with a unit to generate a pressure burst to blow the foreign matter (F) out through the opening. The apparatus (1) to detect and separate foreign matter (F) from material (M) carried in an air stream, and especially cotton fibers, has a detector (3) and at least one ejection opening (4) in the carrier channel (2) with a unit (5) to generate a pressure burst to blow the foreign matter (F) out through the opening (4). A unit (21) generates an auxiliary gas flow (H) generally parallel to the carrier gas flow (G), to pass at least partially over the ejection opening (4). The auxiliary gas flow (H) is generated through at least one air opening (21), in front of the ejection opening (4) in the direction (R) of material travel. The air opening (21) is linked to a compressed air supply, or it draws in air by suction from the atmospheric pressure in the passage channel (2). A throttle flap controls the auxiliary gas flow (H). The air opening (21) for the auxiliary gas flow (H) is set so that the flow joins the main carrier gas flow (G). A guide surface in front of the ejection opening (4) carries the auxiliary flow (H) on the side towards the passage channel (2). An Independent claim is included for a cotton fiber cleaning action, where the auxiliary gas flow (H) is interrupted at least partially while a lateral pressure burst blows foreign matter through the ejection opening.